Hand Tools Archive

Subject:
Coupla random thoughts

Wiley Horne
1. I’m pretty sure I recall that Steve Knight cryo’ed his O1, and ended up not less than RC60. Maybe the cryo really mattered, in getting all the austenite converted to martensite.

2. The metallurgist John Verheuven, in Steel Metallurgy for Non-Metallurgists, shows quenching data that demonstrates the problem in through-hardening unalloyed high carbon, such as 1095 (same as W1), when the thickness gets above 0.09” (3/32”). When you get up toward 1/8” or 0.145”, it takes extremely fast quench times to avoid the formation of pearlite or bainite in preference to martensite. And the problem gets worse with finer-grain steel. Alloying allows longer quench times before the undesirable stuff begins to form. So LN would have been caught between the necessity of very rapid quench on the one-hand, and the consequences of very rapid quench on the other hand. All of which supports your thesis about heat treat being the issue with W1. I still have my W1 iron in a bronze LN4 and it’s a honey.

3. The most ideal steel I have seen is Tasai’s forgings blue steel forgings, for edge, edge-holding snd sharpenability. I think it is the harder tier of blue 2, which would mean about 1.2% carbon. That said, I just love steel, and think the carbon atom is the most amazing thing under the sun.

Over and out (as John A. says😀).

Wiley

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Haha!
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That post was what I truly appreciate about David
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Coupla random thoughts
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Re: in all of this...
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